CN113270633A - Manufacturing method of flame-retardant packaging material for square aluminum shell lithium ion battery - Google Patents
Manufacturing method of flame-retardant packaging material for square aluminum shell lithium ion battery Download PDFInfo
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- CN113270633A CN113270633A CN202110821798.6A CN202110821798A CN113270633A CN 113270633 A CN113270633 A CN 113270633A CN 202110821798 A CN202110821798 A CN 202110821798A CN 113270633 A CN113270633 A CN 113270633A
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- Prior art keywords
- flame
- retardant
- lithium ion
- ion battery
- square aluminum
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K21/00—Fireproofing materials
- C09K21/06—Organic materials
- C09K21/12—Organic materials containing phosphorus
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Public Health (AREA)
- Organic Chemistry (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a manufacturing method of a flame-retardant packing material for a square aluminum-shell lithium ion battery, which comprises the flame-retardant packing material, the square aluminum-shell lithium ion battery and a flame-retardant filler mixture filled in the flame-retardant packing material, wherein the flame-retardant filler mixture is formed by uniformly mixing a flame retardant and an expanding agent, the mass ratio of the flame retardant is 65-75%, and the mass ratio of the expanding agent is 25-35%. Compared with the prior art, the invention has the advantages that: the invention has strong operability, is economical and practical, and the newly added flame-retardant wrapping material is arranged in the square aluminum shell on the premise of not changing the production equipment and the production process of the existing square aluminum shell lithium ion battery, so that the main structure of the battery core is not changed, the fuel-resistant wrapping material is not released when the battery core is not out of control due to heat, the electrochemical performance of the electrolyte is not influenced, the electrical performance of the lithium battery is ensured, and the welding position of the lug has enough space to realize the setting of the flame-retardant wrapping material.
Description
Technical Field
The invention relates to a design of a flame-retardant packaging material for a lithium ion battery with a square aluminum shell, in particular to a manufacturing method of the flame-retardant packaging material for the lithium ion battery with the square aluminum shell.
Background
Under the call of carbon peak and carbon neutralization, the vigorous development of new energy electric automobiles promotes the development of lithium batteries using electrochemical energy to store energy. The lithium ion battery has the advantages of high energy density, high voltage, long cycle life and the like. However, the safety problem of lithium ion batteries is the key to the development of lithium ion batteries. Lithium ion batteries are used as energy conversion carriers, and safety is also a precondition for commercialization of the lithium ion batteries. The positive electrode material of the lithium ion battery generally comprises lithium cobaltate, lithium manganate, lithium nickel manganese cobalt and lithium iron phosphate; the negative electrode is generally a graphite and silicon-carbon composite material, lithium ions are removed from the positive electrode material in the charging process, and are embedded into the negative electrode material through an electrolyte and a diaphragm, so that the positive electrode of the lithium ion battery in a fully charged state has strong oxidizing property, and the negative electrode has strong reducing property. The adopted electrolyte is LiPF6, and LiPF6 is easily decomposed by heating and is sensitive to water; the electrolyte solvent is generally a carbonate organic solvent, has a low flash point, and can cause thermal runaway inside the battery under the conditions of overcharge, overdischarge, overheating and the like of the battery, so that the combustion and even deflagration of the battery can be caused.
In order to solve the problem of thermal runaway of the battery, the invention provides a flame-retardant packaging material which is added in a square aluminum shell lithium ion battery shell, when the thermal runaway occurs in the lithium ion battery, the temperature rise of the position of a lug is obvious, so that a fuel-resistant package expands and breaks, a flame retardant is released, and the safety control is realized from a thermal runaway source in the battery.
In the prior art I, a pressure release valve capable of being closed secondarily is added on a cell structure, namely a square power lithium ion battery with a secondary sealing valve (patent No. CN 202022553831.5), when the internal part of the lithium ion battery is out of control due to heat, a large amount of gas is generated, so that the internal air pressure of a cell shell is increased, when the internal air pressure is increased to the threshold value of the pressure release valve, the effect of releasing the internal air pressure of the cell is achieved, and meanwhile, partial heat is taken away to relieve the heat accumulation of the cell; when the internal gas pressure of the battery is smaller than the opening pressure of the pressure relief valve, the pressure relief valve is closed timely to realize the secondary sealing of the lithium ion battery; according to the technical scheme, the pressure release valve is arranged on the battery structure, and when the internal pressure of the battery is too high, the risk of battery explosion caused by thermal runaway of the battery is reduced by adopting a pressure release method. And the secondary sealing is substantially meaningless for the battery. When thermal runaway occurs in the battery and a large amount of gas is generated, the internal structure of the battery is damaged, or the electrolyte of the battery is abnormally consumed, so that a large amount of gas is generated, or the internal resistance of the battery is abnormally increased due to the abnormal growth of an SEI film on the surface of a negative active material, and the like, the battery which is subjected to the thermal runaway basically cannot be continuously used.
In the second prior art, a flame retardant additive is directly added into an electrolyte to reduce the flammability of the electrolyte; a preparation method of a lithium ion battery flame-retardant electrolyte containing a cyclotriphosphazene ring (patent number: CN 202010028552.9) comprises the steps of preparing cyclotriphosphazene-based hexabasic lithium phosphate (LiTHP), mixing the cyclotriphosphazene-based hexabasic lithium phosphate (LiTHP) with cyclotriphosphazene hexabasic phosphate (RTHP) according to a certain proportion, dissolving the mixture into a proper solvent, adding an overcharge-preventing additive and an SEI film forming additive, and compounding to obtain the lithium ion battery flame-retardant electrolyte for the lithium ion battery, wherein the electrochemical characteristics of the electrolyte are necessarily reduced with the introduction of the flame-retardant additive. Such as a reduction in Li + diffusion coefficient, a reduction in electrolyte conductivity, etc.
Disclosure of Invention
The invention provides a design of a flame-retardant packaging material suitable for a square aluminum shell lithium ion battery on the basis of the research of predecessors. Aims to solve the problem of battery fire caused by thermal runaway of a square aluminum-shell lithium ion battery.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the lithium ion battery comprises a flame-retardant packaging material, a square aluminum shell lithium ion battery and a flame-retardant filler mixture filled in the flame-retardant packaging material, wherein the flame-retardant filler mixture is formed by uniformly mixing a flame retardant and an expanding agent, the mass ratio of the flame retardant is 65-75%, and the mass ratio of the expanding agent is 25-35%.
Furthermore, the flame-retardant package material is a high-density polyethylene film material with a melting point of 130 ℃ or a polypropylene material.
Further, the flame retardant is one or more of trimethyl phosphate, triethyl phosphate, triphenyl phosphate and tributyl phosphate, and the expanding agent is one or more of ammonium chloride, ammonium phosphate, potassium bicarbonate and tetrafluorodibromoethane.
Further, the flame retardant is trimethyl phosphate, the expanding agent is ammonium chloride and ammonium phosphate, the trimethyl phosphate, the ammonium chloride and the ammonium phosphate are mixed according to the mass ratio of 7:2:1 to form a flame-retardant filler mixture, 10g of the flame-retardant filler mixture is taken, the flame-retardant filler mixture is packaged by using a flame-retardant packaging material, and the shape of the flame-retardant packaging material can be a bag package or a cylindrical capsule package.
Furthermore, fire-retardant package material set up in square aluminum hull lithium ion battery's utmost point ear position, also can be the apron intermediate position, can also be other positions of casing, as long as guarantee inside square aluminum hull, do not influence electric core inner structure can.
After the method is adopted, the invention has the following advantages: the invention has strong operability, is economical and practical, and the newly added flame-retardant wrapping material is arranged in the square aluminum shell on the premise of not changing the production equipment and the production process of the existing square aluminum shell lithium ion battery, so that the main structure of the battery core is not changed, the fuel-resistant wrapping material is not released when the battery core is not out of control due to heat, the electrochemical performance of the electrolyte is not influenced, the electrical performance of the lithium battery is ensured, and the welding position of the lug has enough space to realize the setting of the flame-retardant wrapping material.
Detailed Description
The present invention is described in further detail below.
The manufacturing method of the flame-retardant packing material for the square aluminum-shell lithium ion battery comprises the steps of uniformly mixing a flame-retardant packing material, the square aluminum-shell lithium ion battery and a flame-retardant filler mixture filled in the flame-retardant packing material, wherein the flame-retardant filler mixture is formed by uniformly mixing a flame retardant and an expanding agent, the mass percentage of the flame retardant is 65-75%, and the mass percentage of the expanding agent is 25-35%.
The flame-retardant packing material is made of a high-density polyethylene film material with a melting point of 130 ℃ or a polypropylene material.
The flame retardant is one or more of trimethyl phosphate, triethyl phosphate, triphenyl phosphate and tributyl phosphate, and the flame retardant is hexamethyl phosphazene of phosphazene, wherein the expanding agent is one or more of ammonium chloride, ammonium phosphate, potassium bicarbonate and tetrafluorodibromoethane.
The flame retardant is trimethyl phosphate, the expanding agent is ammonium chloride and ammonium phosphate, the trimethyl phosphate, the ammonium chloride and the ammonium phosphate are mixed according to the mass ratio of 7:2:1 to form a flame-retardant filler mixture, 10g of the flame-retardant filler mixture is taken, and the flame-retardant filler mixture is packaged by using a flame-retardant packaging material.
The flame-retardant packing material is arranged at the lug position of the square aluminum shell lithium ion battery, the connection mode of the flame-retardant packing material and the battery cell can be bonding, adhesive tape auxiliary adhesion, direct and cover plate fixed connection, and direct setting without adhesion.
The invention is implemented as follows: firstly, preparing a square aluminum shell lithium ion battery, homogenizing, coating, rolling, slitting, die cutting, baking a pole piece, laminating according to a normal process, connecting two laminated core packages in parallel and welding, and is welded with the cover plate by laser, a welded core package is stuck with a Mylar film and then placed into a shell, then the prepared flame-retardant packing material is arranged at the position of a pole ear of the square aluminum shell lithium ion battery, the flame retardant selected by the flame-retardant filler mixture in the flame-retardant packing material is trimethyl phosphate, mixing with expanding agents ammonium chloride and ammonium phosphate according to the mass ratio of 7:2:1, wherein the flame-retardant packaging material can be arranged at the positions of positive and negative pole lugs, the middle position of a cover plate or other positions of a shell, as long as the flame-retardant packaging material is arranged in a square aluminum shell and does not influence the internal structure of the battery cell, and finally the cover plate is welded, and checking the air tightness of the battery cell, injecting liquid into the battery cell, standing, and preparing into a target battery cell through formation.
The present invention and its embodiments have been described above, but the description is not limitative, and the actual structure is not limited thereto. In summary, those skilled in the art should, without departing from the spirit of the present invention, devise similar structural modes and embodiments without inventively designing them, and shall fall within the scope of the present invention.
Claims (5)
1. A manufacturing method of a flame-retardant packing material for a square aluminum shell lithium ion battery is characterized by comprising the following steps of: the lithium ion battery comprises a flame-retardant packaging material, a square aluminum shell lithium ion battery and a flame-retardant filler mixture filled in the flame-retardant packaging material, wherein the flame-retardant filler mixture is formed by uniformly mixing a flame retardant and an expanding agent, the mass ratio of the flame retardant is 65-75%, and the mass ratio of the expanding agent is 25-35%.
2. The manufacturing method of the flame-retardant packing material for the square aluminum-shell lithium ion battery according to claim 1, characterized in that: the flame-retardant packing material is made of a high-density polyethylene film material with a melting point of 130 ℃ or a polypropylene material.
3. The manufacturing method of the flame-retardant packing material for the square aluminum-shell lithium ion battery according to claim 1, characterized in that: the flame retardant is one or more of trimethyl phosphate, triethyl phosphate, triphenyl phosphate and tributyl phosphate, and the expanding agent is one or more of ammonium chloride, ammonium phosphate, potassium bicarbonate and tetrafluorodibromoethane.
4. The manufacturing method of the flame-retardant packing material for the square aluminum-shell lithium ion battery according to claim 3, characterized in that: the flame retardant is trimethyl phosphate, the expanding agent is ammonium chloride and ammonium phosphate, the trimethyl phosphate, the ammonium chloride and the ammonium phosphate are mixed according to the mass ratio of 7:2:1 to form a flame-retardant filler mixture, 10g of the flame-retardant filler mixture is taken, and the flame-retardant filler mixture is packaged by using a flame-retardant packaging material.
5. The manufacturing method of the flame-retardant packing material for the square aluminum-shell lithium ion battery according to claim 1, characterized in that: the flame-retardant packing material is arranged at the position of a lug of the square aluminum shell lithium ion battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110821798.6A CN113270633A (en) | 2021-07-21 | 2021-07-21 | Manufacturing method of flame-retardant packaging material for square aluminum shell lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110821798.6A CN113270633A (en) | 2021-07-21 | 2021-07-21 | Manufacturing method of flame-retardant packaging material for square aluminum shell lithium ion battery |
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| Publication Number | Publication Date |
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| CN113270633A true CN113270633A (en) | 2021-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110821798.6A Pending CN113270633A (en) | 2021-07-21 | 2021-07-21 | Manufacturing method of flame-retardant packaging material for square aluminum shell lithium ion battery |
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| Country | Link |
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| CN (1) | CN113270633A (en) |
Citations (9)
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| CN101369640A (en) * | 2007-08-15 | 2009-02-18 | 联想(北京)有限公司 | Flame-proof battery |
| CN106176670A (en) * | 2016-08-30 | 2016-12-07 | 江苏苏南药业实业有限公司 | A kind of famotidine medical resin microcapsule |
| CN107069076A (en) * | 2016-12-29 | 2017-08-18 | 中国电子科技集团公司第十八研究所 | High-safety high-power lithium ion battery |
| CN206477473U (en) * | 2017-02-27 | 2017-09-08 | 郑州电子信息职业技术学院 | A kind of civil engineering fire wall |
| CN107863460A (en) * | 2017-11-08 | 2018-03-30 | 江苏悦达新能源电池有限公司 | A kind of flame retardant coating for lithium battery pack and preparation method thereof |
| CN109589541A (en) * | 2018-10-19 | 2019-04-09 | 江山市龙江消防材料有限公司 | Lithium battery extinguishing chemical and lithium battery extinguishing device |
| CN112103435A (en) * | 2020-09-23 | 2020-12-18 | 中国电力科学研究院有限公司 | Energy storage battery module flame-retardant structure and method |
| CN112201890A (en) * | 2020-10-30 | 2021-01-08 | 固德电材系统（苏州）股份有限公司 | Laminate polymer battery electricity core firebreak device and laminate polymer battery module |
| CN112467292A (en) * | 2020-11-09 | 2021-03-09 | 合肥国轩高科动力能源有限公司 | Safety flame-retardant protection device for lithium ion battery |
-
2021
- 2021-07-21 CN CN202110821798.6A patent/CN113270633A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369640A (en) * | 2007-08-15 | 2009-02-18 | 联想(北京)有限公司 | Flame-proof battery |
| CN106176670A (en) * | 2016-08-30 | 2016-12-07 | 江苏苏南药业实业有限公司 | A kind of famotidine medical resin microcapsule |
| CN107069076A (en) * | 2016-12-29 | 2017-08-18 | 中国电子科技集团公司第十八研究所 | High-safety high-power lithium ion battery |
| CN206477473U (en) * | 2017-02-27 | 2017-09-08 | 郑州电子信息职业技术学院 | A kind of civil engineering fire wall |
| CN107863460A (en) * | 2017-11-08 | 2018-03-30 | 江苏悦达新能源电池有限公司 | A kind of flame retardant coating for lithium battery pack and preparation method thereof |
| CN109589541A (en) * | 2018-10-19 | 2019-04-09 | 江山市龙江消防材料有限公司 | Lithium battery extinguishing chemical and lithium battery extinguishing device |
| CN112103435A (en) * | 2020-09-23 | 2020-12-18 | 中国电力科学研究院有限公司 | Energy storage battery module flame-retardant structure and method |
| CN112201890A (en) * | 2020-10-30 | 2021-01-08 | 固德电材系统（苏州）股份有限公司 | Laminate polymer battery electricity core firebreak device and laminate polymer battery module |
| CN112467292A (en) * | 2020-11-09 | 2021-03-09 | 合肥国轩高科动力能源有限公司 | Safety flame-retardant protection device for lithium ion battery |
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Application publication date: 20210817 |
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